James mason



(No Model.)

J. MASON.

FURNAGB POR BURNING PYRITBS. No. 274,453. Panama Mar. 20, 1883,

N. PETERS. rfvnumagnpmv. @mmm ne UNI-TED STATI-3s PATENT Finca.

JAMES MASON, OF EYNSHAM HALL, VVITNEY, COUNTY OF OXFORD, ENGLAND.

FU RNACE FOR BURNING PYRITES.

SPECIFICATION forming part of Letters Application filed July 29, 1882.(No model.)

To all whom it ina-y concern: y

Be it known that I, JAMES-Mason, a subject of the Queen of GreatBritain, residing at Eynsham Hall, W'itney, county of Oxford, En land,have invented certain Improvements in Furnaces for Burning Pyrites, (forwhich l have obtained a patent in Great Britain, 'dared the 16th day ofJune, 1882No. 2,851,) of which the following is a specification.

This invention relates to improvements in that class of furnaces forburning pyrites in which the pyrites are subjected to heat in aninclined bed, 'down which they are fed by a series of rollers.'According to my said improvements, the cylinders or rollers used insuch furnaces, instead of having smooth or continuous flutes orprojections along their surfaces, have the utes serrated or notched orcovered with studs or projections regularly or irregularly disposed andof any convenient figure.

Figures l, 2, 3, 4, and 5 of the accompanying drawings representportions of such cylinders or rollers, illustrating under variousmodifications my improvements in this respect. Fig. l represents thedisposition of the projections which 1 prefer. Fig. 2 is a transversesection of the same drawn to a larger scale. The studs a are cast orotherwise formed on or iixed to the body A of the Vcylinder or roller,which is formed with turned ends or journals to project to outside thefurnace and there be mounted on bearings, and provided with means fordriving them, as is usual or convenient. The said studs a are disposedin rows parallel to the axis of the cylinder or roller, by whichdisposition they may be readily cleared of any obstruction withoutstopping the furnace, which clearance can be eifected by a pointedsteelrodintroduced through cleanin g-holes made for the purpose ineither side or both sides of the furnace, over the axle of each cylinderorv roller, the said steel rod being worked along the lines of spaces o3between the teeth or projections a. Fig. 3 represents the studs orprojections arranged in helical lines around the cylinder or roller A.Fig. et represents the studs or projections et formed by serratedlongitudinal flutes b. Fig. 5 represents the said studs or projections aas being formed by serrated rings or annular lines c. The studs of thecylinders or rollers may be Patent No. 274,453, dated March 20, i883,

Patented in England June 16, 1893, No. 2,851.

l placed so as to interlace with those of the adjacent ones, or a seriesof serrated rings may be arranged alternating with and passing intocorresponding recesses i ders or rollers.

In certain cascs--ior example, where it is desired to treat poor cuprouspyritesarthe bed of the furnace.

Fig. 6 represent-s a longitudinal section of a furnace provided withthis improvement. rlhe furnace-bed l) l)2 has at e the temporaryfireplace employed for the purpose of heating up and starting thefurnace, communicating by theliues c2 with the upper end of the furnace,through which the Vproducts of combustion pass and out by the fines e3e3 to the chimney. Toward the lower end ofthe furnace I form another andpermanent or continually-acting fire-place., f, from which the productspass by the iiuefz, situated underneath the lower part of the bed of thefurnace, and away by the flue f3 to the chimney. By the re in thelire-place j the lower cylinders are continually ina-insaid dre-place ffrom the lower ends of the furnace depending. upon the total length of.the furnace and number of cylinders used, so as to heat the number ofthe lower cylinders that require-such heating. By this means in a givensized furnace I am able to extract about one per cent. more sulphur fromthe ore than has hitherto been practicable and to increase theproportion of the soluble copper to the insoluble copper.

In order to enable the furnace to be construeted of considerable lengthwithout the necessity for using a shaft or shafts of inconvenient weightto drive the cylinders or rollers, I separate the whole number ofcylinders or rollers in the furnace into sets or series, each moved byits own shaft or shafts. To facilitate this arrangement I construct thefurnace 'with the bed in two or more portions and at differentelevations, so that although the several beds thus formed are inparallel planesthat is to say, have the same inclinationyet between theparts which are to be driven by separate shafts there is a drop orset-olf, as at g in Fig. 6, in which figure 1 have shown but two bedshaving separate drivin g-shafts 5 but it will be understood that theremay be more range a fire-place underneath the lower end of n theadjacent. cylin- Y tained at a dull red heat, the distance ot' the IOCthan two if the length of the furnace should I render it necessary ordesirable. The series of cylinders or rollers in the part D are drivenby gearing on the shaft h, and those in the part D2 are driven bygearing on the shaft t'. There may be shafts on either or on both sidesof the furnace, and when shafts are used on both sides they maydrive-alternate cylinders or rollers on each side or otherwise, as maybe convenient. The shafts 7L t' may be driven by one engine or motor,either by transmitting the motion of one shaft to the other or by othermeans. The rolls or cylinders may be geared to their shafts in anysuitable wayas, for exam ple, by worm-gearing, as shown in my Patent No.241,685, dated May 17, 1881.

- The arched construction of the lower part of the furnace givesfacility for the hereinbe-v 'lore-described arrangement of shafts.

1 am aware that heretofore rollers having spikes or teeth have been usedin furnaces to aid in feeding and stirring the ore; but in the furnaceherein described for treating pyrites ores the inclined series ofrollers form a traveling bed for slowly carrying the ore through theroasting-chamber. In operation the ore is ignited by thetemporarily-acting fireplace at the upper end of the furnace, and theburning ore is gradually fed down over the top of the rolls orcylinders, which are rotated at a proper speed, the heat of the lowerrolls of the series being maintained by the permanentlyactingiire-placeat thelower end of thefurnace.

For a fuller description of the operation of the furnace reference maybe had to my Patent No. 241,685, above named, and to theroasting-furnace therein described, upon which the present invention isan improvement.

Iyclaim- 1. In a furnace for burning pyrites, the series of rollersconstituting a traveling bed for feed- .ing forward the ore undertreatment, the said rollers being provided with projections, studs,serrated rings, or ribs, substantially as described.

2. In a furnace for burning pyrites, the inclined series of feed rollersor cylinders constituting a traveling bed for the ore, said rollers orcylinders being provided with studs or projections, substantially asdescribed.

3. In a furnace for burning pyrites, the feed rollers or cylindersconstituting a traveling bed for the ore, vsaid rollers or cylindersbeing` provided with studs or projections arranged in rows parallel withthe axes ofthe rollers, substantially as and for the purpose set forth.

4. rIhe feed cylinders or rollers arrangedin different but parallelinclined planes, each series of rollers being operated by a separateshaft or shafts, substantially as described.

5. In a'furnace for roasting pyrites ores, having a traveling' bedcomposed of a series of rollers, as setforth, and provided with a{ire-place at the upper end for starting the combustion of the ore, theadditional fire-place at the lower part ofthe furnace for keeping thelower rolls of the series at therequired temperature, substantially asdescribed.

In testimony whereof I have signed my name to this specilication in thepresence of two subscribing witnesses.

n l JAMES MASON. Witnesses:

WILLIAM GEDDEs, 2 Castelnau Gardens East, Barnes.

EDWARD N. Hows, t 2 Popes Head Alley, Oornhill, London E. 0., Gent. l

